Mothproofing



Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE MICHAEL G. MINAEFF,"OF BROOKLYN, NEW YORK, ASSIGNOR TO THE LARVEX COR- PORATION, OF NEWYORK, N. Y.,

Av CORPORATION OF NEW YORK MOTHPROOFIING No Drawing.

This invention relates to moth proofing and is herein disclosed asapplied to woolen goods which-are moth proofed with hydrocarbonderivatives of thiourea.

It has been found that when the ordinary woolen fabric of commerce isimmersed in a suitable solution of allyl-tliiourea, phenylthiourea, oro-tolyl-thiourea, it becomes immune from attack by moth larvae, such asnormally attack and destroy woolen materials under similar conditions.

A two per cent solution has been found satisfactory. It was found thatlong immersion was unnecessary, and that the fabric was not affected inany degree, except for its immunity to'attack by moth larvae.

In some cases it is advisable to include an other substance orsubstances, especially such as will facilitate the wetting of the woolenmaterial to be mothproofed. This may be advantageous whether thematerial is mothproofed by spraying or by immersion.

E sample 1.An acetone solution was prepared containing two per centphenyl thiourea 2 and woolen goods were wetted therewith by immersion,then drained and dried. These goods proved to be unattacked by mothlarvae when untreated goods, under parallel conditions, were destroyedby the larvae.

Example 2.A similiar solution of allylthiourea was prepared and with itwas treated other woolen goods with thesame mothproofing result.

Example 3.A similar solution of o;tolyl i5 thiourea was prepared andwith it was treated other woolen goods with the same mothproofingresult.

It is also possible to use an aqueous solution for the moth proofingoperation, prefer- 0 ably first dissolving the thiourea derivative inacetone or other suitable organic solvent and then mixing with water. Itis usually preferable to include in the moth proofing solution a wettingagent which causes the solution to wet. and distribute itself rapidlyand uniformly through the wool.

The foregoing compounds all contain one amino group in which there is nosubstitute for hydrogen, and also one amino group containing ahydrocarbon radical. v

Application filed October 11, 1928. Serial No. 311,969.

Having thus described certain embodiments-of my invention, what I claimis:

1. The process of moth-proofing material which consists in treating itwith a solution carrying a thiourea having one amino group in which ahydrocarbon radical is substituted for one hydrogen and in which oneamino group contains no substitute for hydrogen.

2. The process of moth-proofing material which consists in treating itwith an aqueous solution carrying a small percentage of a thiourea inwhich a hydrocarbon radical is substituted for one hydrogen and in whichone'amino group contains no substitute for hydrogen.

3. The process of moth-proofing material which consists in treating itwith a solution carrying a small percentage of a thiourea in which abenzine ring hydrocarbon radical is substituted for one hydrogen and inwhich one amino group contains no substitute for hydrogen.

4. The process of moth-proofing material which consists in treating itwith a solution carrying a small percentage of a thiourea in which atoluene radical is substituted for one hydrogen and in which one aminogroup contains no substitute for hydrogen.

5. A fibrous material carrying a thiourea having one amino group inwhich a hydrocarbon radical is substituted for one hydrogen and in whichone amino group contains no substitute for hydrogen.

6. A fibrous material carrying a small percentage of a thiourea in whicha hydrocarbon radical is substituted for one hydrogen and in which oneamino group contains no sub-- stitute for hydrogen.

7. A fibrous material carrying a small percentage of a thiourea in whicha benzine ring hydrocarbon radical is substituted for one hydrogen andin which one amino tains no substitute for hydrogen.

Signed at 250 Park Avenue, in the county of New York and State of NewYork this 4th day of October, A. D. 1928.

MICHAEL G. MINAEFF.

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